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Old 07-16-2018, 06:34 PM   #1
Zmanwrx23
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Default Stage 3 Clutch Options/Advice/Reviews

Hey guys!

I am nearing the end of my complete motor build and have reached the stage where I need to pick out a clutch. I am looking for advice/user input for clutches in the stage 3 range.

To start, I have a 2006 WRX sedan, with a full 2007 STi driveline swap. I am building a full closed deck block, using a Garret GT3076R, e85, etc etc etc. Car is set to make around 500 wheel horsepower, less than that for torque. I can provide more build details if anyone has questions.

Let me detail what I'm looking for. First and foremost, this car is my DD so I'd like a streetable clutch, I do however actually like a stiffer pedal and enjoy having to "work" it a bit more, idk why. This car also sees a fair amount of auto-x and when it reaches completion and is broken in and tuned accordingly, I would like to take it to some of the local drag strips and get some eighth and quarter runs in just for fun.

I'd like to stick to a single disc clutch if possible as they are significantly cheaper than the twin discs, I am aware of the advantage of twin and triple discs, just trying to save some coin as I have splurged on just about everything else on this build lol.

I have an aftermarket clutch currently in my build that was brand new with my swap, I do not remember the brand off the top of my head but its full faced on both sides. Pedal throw is significantly stiffer than OEM. I have driven a 6 puck clutch a few times (not in a Subaru), they're not awful but I think I'd still prefer a faced or segmented disc style.

I have my eye on Comp Clutches stage 3 drag clutch. It is segmented on both sides and is rated at 500 ft/lbs. I have concerns with this however. First, is that 500 ft/lbs number rated at the crank/flywheel or at the wheels? Second, will it be able to handle high rpm launches? I don't plan on launching it all the time but my tune will allow for launch control and I'll be building a decent amount of boost off the line. Rather not roast it because it slips under high load launches. On my first WRX, I installed a comp stage 2 and I was very pleased with that clutch and I haven't really heard anything bad about this stage 3 clutch. Just trying to examine all my options and make sure I get something that can handle the power I'll be making.

Mainly, I'm looking to hear from those of you that make or have made similar power, and what clutches you used, and how you liked them and how they held up to use etc. I am well versed in driving stick, launching, rev-matching etc. I am aware of proper clutch break in procedures and wont be beating on it out of the box. I could probably live with any clutch that I chose but for this being my DD and as much time/money as I've invested into making it into what it is, it would be a shame for it to have a clutch I hated driving.

Thank you for reading this wall of text. Any input is greatly appreciated!
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Old 07-16-2018, 08:54 PM   #2
viper_crazy
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Considering that you're going for a Stage 3 clutch, that's a lot of extra spring rate in the pressure plate for an OEM clutch fork....if you have an OEM clutch fork. Have you considered upgrading the clutch fork? I broke mine with an Exedy Stage 2 about a month and a half ago and replaced with a Verus Engineering unit.
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Old 07-16-2018, 10:35 PM   #3
Zmanwrx23
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Viper, I see you own a WRX, I think i read somewhere that the 5spd trans comes with like a stamped steel fork where as the 6spds (I have an 07 STi trans) have a cast steel design which holds up much better to punishment. I could be remembering wrong. I will keep with the stock one for now but thanks for the heads up, I'll look into getting a upgraded one down the line.
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Old 07-16-2018, 11:10 PM   #4
viper_crazy
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Ah, I missed that bit. Carry on. LOL
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Old 07-18-2018, 10:01 AM   #5
Zmanwrx23
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Bump for more responses!
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Old 07-20-2018, 06:43 PM   #6
Zmanwrx23
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Bumpity
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Old 07-20-2018, 10:06 PM   #7
viper_crazy
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I think you might be better off asking this question to a tuner or shop that has dealt with these kinds of numbers. Majority of people on here are like "Stage 2, Bro" power levels and have no experience for the information you're seeking.

That being said, while I have no experience with clutches for torque numbers you're fixing to achieve, I'm afraid your choices are literally limited to the torque capacity the clutch can handle, what you're going to be asking the clutch to hold, and the options available for your motor/setup within those boundaries. If there isn't a clutch that fits the bill, then you either have to live with a clutch you may not particularly enjoy for the sake of having those numbers under your belt or lower your power levels for the sake of drivability.
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Old 07-22-2018, 02:25 PM   #8
Zmanwrx23
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Quote:
Originally Posted by viper_crazy View Post
I think you might be better off asking this question to a tuner or shop that has dealt with these kinds of numbers. Majority of people on here are like "Stage 2, Bro" power levels and have no experience for the information you're seeking.

That being said, while I have no experience with clutches for torque numbers you're fixing to achieve, I'm afraid your choices are literally limited to the torque capacity the clutch can handle, what you're going to be asking the clutch to hold, and the options available for your motor/setup within those boundaries. If there isn't a clutch that fits the bill, then you either have to live with a clutch you may not particularly enjoy for the sake of having those numbers under your belt or lower your power levels for the sake of drivability.
makes sense Viper, I do want to keep those power levels if at all possible so I'll keep reading up on my options and pull the trigger on one. Once I decide and get some miles on it I will bump this thread with my opinions/thoughts on what I chose
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Old 07-22-2018, 02:45 PM   #9
viper_crazy
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Sounds good. I look forward to your thoughts. I'm looking to get higher numbers one day and slowly doing my own research and gathering info.
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